9x^2-60x+80=0

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Solution for 9x^2-60x+80=0 equation:


Simplifying
9x2 + -60x + 80 = 0

Reorder the terms:
80 + -60x + 9x2 = 0

Solving
80 + -60x + 9x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
9 the coefficient of the squared term: 

Divide each side by '9'.
8.888888889 + -6.666666667x + x2 = 0

Move the constant term to the right:

Add '-8.888888889' to each side of the equation.
8.888888889 + -6.666666667x + -8.888888889 + x2 = 0 + -8.888888889

Reorder the terms:
8.888888889 + -8.888888889 + -6.666666667x + x2 = 0 + -8.888888889

Combine like terms: 8.888888889 + -8.888888889 = 0.000000000
0.000000000 + -6.666666667x + x2 = 0 + -8.888888889
-6.666666667x + x2 = 0 + -8.888888889

Combine like terms: 0 + -8.888888889 = -8.888888889
-6.666666667x + x2 = -8.888888889

The x term is -6.666666667x.  Take half its coefficient (-3.333333334).
Square it (11.11111112) and add it to both sides.

Add '11.11111112' to each side of the equation.
-6.666666667x + 11.11111112 + x2 = -8.888888889 + 11.11111112

Reorder the terms:
11.11111112 + -6.666666667x + x2 = -8.888888889 + 11.11111112

Combine like terms: -8.888888889 + 11.11111112 = 2.222222231
11.11111112 + -6.666666667x + x2 = 2.222222231

Factor a perfect square on the left side:
(x + -3.333333334)(x + -3.333333334) = 2.222222231

Calculate the square root of the right side: 1.490711988

Break this problem into two subproblems by setting 
(x + -3.333333334) equal to 1.490711988 and -1.490711988.

Subproblem 1

x + -3.333333334 = 1.490711988 Simplifying x + -3.333333334 = 1.490711988 Reorder the terms: -3.333333334 + x = 1.490711988 Solving -3.333333334 + x = 1.490711988 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.333333334' to each side of the equation. -3.333333334 + 3.333333334 + x = 1.490711988 + 3.333333334 Combine like terms: -3.333333334 + 3.333333334 = 0.000000000 0.000000000 + x = 1.490711988 + 3.333333334 x = 1.490711988 + 3.333333334 Combine like terms: 1.490711988 + 3.333333334 = 4.824045322 x = 4.824045322 Simplifying x = 4.824045322

Subproblem 2

x + -3.333333334 = -1.490711988 Simplifying x + -3.333333334 = -1.490711988 Reorder the terms: -3.333333334 + x = -1.490711988 Solving -3.333333334 + x = -1.490711988 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.333333334' to each side of the equation. -3.333333334 + 3.333333334 + x = -1.490711988 + 3.333333334 Combine like terms: -3.333333334 + 3.333333334 = 0.000000000 0.000000000 + x = -1.490711988 + 3.333333334 x = -1.490711988 + 3.333333334 Combine like terms: -1.490711988 + 3.333333334 = 1.842621346 x = 1.842621346 Simplifying x = 1.842621346

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.824045322, 1.842621346}

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